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Infectivity of entomopathogenic nematodes against the legume pod-borer, Maruca vitrata Fabricius, infesting pigeon pea

Published online by Cambridge University Press:  11 March 2021

R. Pervez Open the ORCID record for R. Pervez [Opens in a new window]  and
U. Rao
R. Pervez*
Affiliation:
Division of Nematology, ICAR – Indian Agricultural Research Institute, New Delhi, India
U. Rao
Affiliation:
Division of Nematology, ICAR – Indian Agricultural Research Institute, New Delhi, India
*
Author for correspondence: R. Pervez, E-mail: [email protected]
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Abstract

The legume pod-borer, Maruca vitrata Fabricius (Lepidoptera: Crambidae) (LPB), is an important insect pest of pigeon pea. Chemical pesticides are generally employed to manage this pest, but because of the soil residue issues and other environmental hazards associated with their use, biopesticides are also in demand. Another benign alternative is to use entomopathogenic nematodes (EPNs) to manage this vital pest. In the present study, the infectivity of ten native EPNs was evaluated against LPB by assessing their penetration and production in the LPB. The effectiveness of the promising EPNs against second-, third- and fourth-instar LPB larvae was also studied. Heterorhabditis sp. (Indian Agricultural Research Institute-Entomopathogenic Nematodes Rashid Pervez (IARI-EPN RP) 06) and Oscheius sp. (IARI-EPN RP 08) were found to be most pathogenic to LPB, resulting in about 100% mortality within 72 h, followed by Steinernema sp. (IARI-EPN RP 03 and 09). Oscheius sp. (IARI-EPN RP 04) was found to be the least pathogenic to LPB larva with 67% mortality. Maximum penetration was exhibited by Heterorhabditis sp. (IARI-EPN RP 06) followed by Oscheius sp. (IARI-EPN RP 08), whereas the lowest rate of penetration was exhibited by Oscheius sp. (IARI-EPN RP 01). The highest rate of production was observed with Oscheius sp. (IARI-EPN RP 08), followed by Oscheius sp. (IARI-EPN RP 04 and 10). Among the tested instars of the LPB larvae, second-instar larvae were more susceptible to EPNs, followed by third- and fourth-instar larvae. The results indicate that Heterorhabditis sp. (IARI-EPN RP 06) and Oscheius sp. (IARI-EPN RP 08) have a good potential to the manage LPB.

Keywords

Biological controlinsectsHeterorhabditisSteinernemaOscheius
Type
Research Paper
Information
Journal of Helminthology , Volume 95 , 2021 , e15
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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